Coto Paper has a export file feature.
This file is gzipped but if unzipped, this is plain text. This plain text data represent your sketch operation one by one from first to last.
So you could see the every sketch process if you try.
Above movie was created with this file feature.
By the way this file format is called 'SSF', this is Small Sketch Format. SSF file can also be exported from another application Small Sketch ( for S Pen ).
I am going to write how to create this movie soon.